Bump SixLabors.ImageSharp from 3.1.7 to 3.1.11

---
updated-dependencies:
- dependency-name: SixLabors.ImageSharp
  dependency-version: 3.1.11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Bearded.Graphics.ImageSharp/Bearded.Graphics.ImageSharp.csproj

@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
+        <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
     </ItemGroup>
 
     <ItemGroup>